package net.llz.echo;

import io.netty.bootstrap.ServerBootstrap;
import io.netty.channel.ChannelFuture;
import io.netty.channel.ChannelInitializer;
import io.netty.channel.EventLoopGroup;
import io.netty.channel.nio.NioEventLoopGroup;
import io.netty.channel.socket.SocketChannel;
import io.netty.channel.socket.nio.NioServerSocketChannel;

public class EchoServer {
    private int port;

    public EchoServer(int port)  {
        this.port= port;
    }

    /**
     * 启动流程
     */
    public void run() throws InterruptedException {
        EventLoopGroup bossGroup = new NioEventLoopGroup();
        EventLoopGroup workGroup = new NioEventLoopGroup();

        try {
            ServerBootstrap serverBootstrap = new ServerBootstrap();
            serverBootstrap.group(bossGroup,workGroup).channel(NioServerSocketChannel.class).childHandler(new ChannelInitializer<SocketChannel>() {
                @Override
                protected void initChannel(SocketChannel sh) throws Exception {

                    sh.pipeline().addLast(new EchoServerHandler());
                }
            });

            System.out.println("Echo 服务器启动ing");

            //绑定端口，同步等待成功
            ChannelFuture channelFuture = serverBootstrap.bind(port).sync();
            //等待服务端监听端口关闭
            channelFuture.channel().closeFuture().sync();

        }finally {
            workGroup.shutdownGracefully();
            bossGroup.shutdownGracefully();
        }
    }

    public static void main(String[] args) throws InterruptedException {
        int port = 8080;
        if(args.length > 0){
            port = Integer.parseInt(args[0]);
        }

        new EchoServer(port).run();
    }
}
